Q. The use of heat exchangers is made in

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Q. In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

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Q. Which of the following statement is correct?

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Q. The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity.

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Q. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is

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Q. The process of adding moisture to the air, without change in its dry bulb temperature, is known as humidification.

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Q. In case of liquids and gases, the heat transfer takes place according to

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Q. The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)

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Q. The radiation emitted by a black body is known as

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Q. Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?

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Q. Which of the following statement is correct?

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Q. According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature.

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Q. In electrolux refrigerator

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Q. Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

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Q. The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.

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Q. Which of the following statement is correct?

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Q. When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

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Q. If a gas is to be liquified, its temperature must be

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Q. The thermostatic expansion valve is used in __________ type of evaporators.

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Q. Thermal conductivity of a material may be defined as the

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